Experimental study on preparation and enhancement effects of nano-lipid ultrasound-enhanced contrast agent / 中华超声影像学杂志

ABSTRACT

Objective To prepare a nano-lipid ultrasound-enhanced contrast agent,then compare it with common-lipid microbubbles to evaluate its enhancement effects.Methods Misce bene a certain proportion of dipalmitoyl phosphatidylcholine(DPPC),distearoyl phosphatidylcholine(DSPE),diphenyl phosphoryl azide(DPPA)and mannitol,incubation them,freeze and thawing some times repeatedly,then used machine succession to prepare the nano-lipid microbubble,observed its base physical properties like morphous,size and surface potential.Healthy rabbit livers were imaged before and after intravenous injection of 2.5 ml/kg of two contrast agents(nano-lipid and common-lipid)in succession,observed the dynamic enhancement effects of the grey scale imaging of the livers and evaluated them subjectively,then used the ultrasonographic quantitative analisis system in type DFY for detecting and analysing the enhancement effects.Results The mean diameter of the nano-lipid microbubbles was 415.8 nm and the surface potential was-(13.7±1.6)mV.The nano-lipid microbubbles could greatly enhance the grey scale imaging of the liver,compare with the common-lipid bubbles,their to-peak-time was later,the peak-continous-time was shorter,the enhancement effects persistence time was longer,its peak intensity was lower than the commonlipid bubbles.Conclusions The self-made nano-lipid microbubbles have a good shape and uniform distribution,they can enhance the grey scale imaging of the liver greatly and provide a protophase foundation for targeting research of tumors.